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Numerical Study of Wake Vortex Interaction with the Ground Using the Terminal Area Simulation SystemA sensitivity study for the in-ground effect on aircraft wake vortices has been conducted using a validated large eddy simulation model. The numerical results are compared with observed data and show good agreement for vortex decay and lateral vortex transport. The vortex decay rate is strongly influenced by the ground, but appears somewhat insensitive to ambient turbulence. In addition, the results show that the ground can affect the trajectory and descent-rate of a wake vortex pair at elevations up to about 3 b(sub o) (where b(sub o) is the initial vortex separation). However, the ground does not influence the average circulation of the vortices until the cores descend to within about 0.6 b(sub o), after which time the ground greatly enhances their rate of demise. Vortex rebound occurs in the simulations, but is more subtle than shown in previous numerical studies.
Document ID
20040086767
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Proctor, Fred H. (NASA Langley Research Center Hampton, VA, United States)
Han, Jongil (North Carolina State Univ. Raleigh, NC, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 1999
Subject Category
Aerodynamics
Report/Patent Number
AIAA Paper 99-0754
Meeting Information
Meeting: 37th AIAA Aerospace Sciences Meeting and Exhibit
Location: Reno, NV
Country: United States
Start Date: January 11, 1999
End Date: January 14, 1999
Sponsors: American Inst. of Aeronautics and Astronautics
Distribution Limits
Public
Copyright
Public Use Permitted.

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